I understand that this has something to do with CAS's interface detection. However, if I run `softIOC` with the following db

```

echo "record(ai,"test_pv") {

field(VAL,"3")

}" > test.db

softIOC -d test.db

```

It works fine and I can `caget testpv` from another container without issue. This leads me to believe that the plumbing is there but that there is some assumption made in how CAS detects broadcast interfaces
that is not holding true in docker.

Have you all been able to successfully run pcaspy or cas-based servers in docker? Are there some environment variables I can set to help cas along?

I should note that setting `EPICS_CAS_INTF_ADDR_LIST="localhost"` WILL allow pcaspy will run in docker, but then the PVs are not visible outside that docker container, so it's not that useful.

Also for reference, here is what ifconfig returns from inside the container: